A chroma scaling psychophysics experiment was conducted using a CRT in a dark surround. The experiment consisted of constant hue and lightness IPT step ramps on a uniform background. Each hue step ramp was displayed on an achromatic, a medium and a high chroma background. The results clearly show that chroma scaling is dependent on the chroma of the background. For the medium chroma backgrounds a modest crispening effect is evident. The results also show that chroma scaling on achromatic and high chroma backgrounds differ considerably. The data for the achromatic backgrounds are used to compare Cab, CIECAM97s C, the revised CIECAM97s chroma, C_F and CIECAM02 C. One phase of the LUTCHI data is also used to verify the results from the visual experiment. CIECAM02 C and C_F both provide good fits to the different data sets relative to Cab. Furthermore, CIECAM02 C and CF both have considerably smaller intercepts for linear fits of the scale versus the correlate relative to CIECAM97s C.
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